An audio frequency is a frequency, or range of frequencies, of
audible sound waves.
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Audio output frequency is that range of frequencies that can be
heard. For humans, that is generally considered to be the range of
20Hz to 20kHz.
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The frequency range used on all modern audio receivers is 10.7
to 12.75 GHz. The IF range is 950 to 2150 MHz. Audio receivers are
also known as radios.
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